Jet impact pulverizer



Aug. 21, 1934. P. ANGER 1,971,092

JET IMPACT PULVERIZER Filed Nov. 27, 1931 Patented Aug. 21, 1934 UNITEDSTATES PATENT OFFICE Application November 2'7, 1931, Serial No. 577,580In Germany October 9, 1930 4 Claims. (CI. 83-46) This invention relatesto a jet impact pulverizer of the kind comprising a funnel the lower endof which is formed into a jet nozzle which communicates with an airsupply pipe,

' materials fed into the funnel being thrown by the air jet against animpact member.

The object of the invention is to prevent a choking up of the nozzle bytramp metal or other heavy materials during the operation of thepulverizer and by the ordinary material remaining in the funnel when theair pressure is cut off, and the invention consists broadly in theprovision of means for discharging such materials through the jetnozzle.

For this purpose an aperture is provided in the deepest part of thepulverizer through which the materials can be discharged on the airpressure in the nozzle being cut off or reduced. A pocket may bearranged to receive the discharged materials, and means are provided fordischarging materials from the pocket without interfering with thenormal working of the pulverizer.

Fig. 1 of the accompanying drawing represents a vertical section of anapparatus according to the invention,

Fig. 2 is a vertical section of a modified form of the apparatus,

Fig. 3 is a vertical section of a further modification,

Fig. 4 is a vertical section of a still further modification,

Fig. 5 is a vertical section showing another modification, and

Fig. 6 is a vertical section showing yet another modification.

The pulverizer comprises the usual funnelshaped vessel 1 fitted with aninlet 2 for the materials to be pulverized and formed at the bottom witha nozzle 3 which communicates with a supply of compressed air and whichproduces within the container an upwardly directed jet. The materialsare blown by the jet through a mixing pipe 4 against an impact member 5,the materials being reduced by the impact. The dust is carried away bythe air current through an uptake 6, and the coarser particles fall backto the bottom of the container for renewed participation in thepulverizing process.

Fig. 1 shows a construction wherein a pocket 7 is arranged under thenozzle 3. This pocket is normally closed by means of a slide valve 8 orthe like. If this slide is opened during the operation of thepulverizer, part of the air will be diverted through the pocket, and thepressure on the nozzle 3 will be considerably reduced.

Specifically heavy particles such as stones and pieces of metal, willtherefore be able to sink through the (nozzle into the pocket and thenceinto the open. As soon as the valve is closed normal working of theapparatus is resumed.

The foreign particles can also be sorted out by stopping the blower inwhich case the contents of the vessel 1 will fall into the pocket whenceit can be discharged when required.

In the arrangement according to Fig. 2 the pocket is fitted with a valvein the form of a vaned wheel 9 which allows the materials to bedischarged from the pocket without disturbing the normal working of theapparatus.

Fig. 3 shows an arrangement with two slide valves 10 and 11. With thisarrangement the blower can be stopped for a short time to enable theheavy particles to settle on the top valve, and they can then bedischarged by opening one valve at a time after the normal working hasbeen resumed. The separating 01f of the heavy particles can also beeffected by first opening the top valve and then stopping the blower tolet the particles fall on the bottom valve. Then the top valve can beclosed and the normal working resumed while the valve 11 is opened forthe discharge of the materials.

Instead of stopping the blower, it may in some cases be sufiicient toreduce the pressure in the nozzle to enable the heavy particles to fallthrough. The reduction of the pressure in the nozzle can be effected bythe provision of a branch pipe 14 on the supply pipe 12. A valve 13 inthis branch pipe can be opened for discharging part of the air throughthe pipe instead of through the nozzle 3. Since the air thus discharged,though it is free from dust, may be disagreeably hot, it may beadvantageous to continue the pipe 14 as a by-pass and connect it to thevessel 1. Fig. 4 shows such an arrangement, the by-pass 17 beingconnected by means of a valve 13' and an extension 14' to the vessel 1above the level of the impact member 5.

The arrangement shown in Figs. 3 and 4 can also be applied to theconstruction shown in Figs. 1 and 2.

In the arrangement shown in Fig. 5 the bent supply pipe 12 is provided,under the nozzle 3, with an aperture which is normally closed by a flapvalve 15. When this valve is open the materials are discharged into areceptacle 16.

Fig. 6 shows a similar arrangement, but the valve 15' is arranged toopen inwards instead of outwards, and the air pressure will thereforetend to maintain the valve closed. When the valve is in the positionshown by dotted lines, the air pipe is, closed, and the materials willbe discharged into the receptacle 16.

I claim:

1. A jet impact pulverizer of the character described, comprising anupright funnel, means for feeding materials into said funnel, an impactmember in said funnel, a bent air-supply pipe connected to the lower endof the funnel and having an aperture aligned with the ertical axis ofthe funnel, means for closing the aperture, and a vertical mixing pipesupported centrally within the funnel between the lower end of thelatter and said impact member."

PAUL ANGER.

